Boiler.



No. 695,6l4. Patented Mar. l8,- I902.

c. F. LAPE.

BOILER.

(Application flied Aug. 10 1899.) (No Model.)

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TM: NORRIS PETERS co, FHOTD-LITHQ. wnsmnomn. o. c.

UNITED STATES T N OFFICE- CHARLES F. LAPE, OF SAN BERNARDINO,CALIFORNIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 695,614, dated March18, 1902.

Application filed August 10, 1899. $erial No..726,776. (NdmocleL) T0 towhom it may concern.-

Beitknown that 1, CHARLES F. LAPE, a citizen of the United States,residing at San Bernardino, in the county of San Bernardino and State ofCaliforhia,have invented certain new and useful Improvements in Boilers,of which the following is a specification.

My invention relates to that class of boilers known as flue-boilers, inwhich tubes or flues are used for the purpose of conducting heat througha body of water and heating the same to such an extent as to form steam;and it relates particularly to the means by which the tubes areconnected to the tubesheets, all of which will more fully hereinafterappear.

The object of my invention is to provide a simple, economical, andefficient flue-boiler.

Afurther object is to provide meansby which the tubes or lines andtube-sheets may be connected together, so as to minimize the dangerousand objectionable burning of the ends of the fiues; and the inventionconsists in the features, combinations, and details of constructionhereinafter described and claimed.

The accompanying drawingis substantially a full-sized view of a sectionof a tube-sheet, showing my improvements in engagement therewith.

In the art to which this invention relates it is Well known that thetubes or fines in tubesheets are connected together by having the endsof the tubes project from the tubesheets and then roll over on the sameand on the outside thereof. The projecting ends of these tubes or fluesare liable to be burned by the intense heat of the gases and fuel,whichat times reach almost to the point of incandescence. This burning takesplace owing to the remoteness of the ends from the water, and before theheat is transmitted to the water the ends are liable to be burned. Myinvention therefore is intended, primarily, to remove these objectionsby providing a b'iler in which the tube-sheets are countersunk and theends of the tubes rolled over, so as to engage withthe tube sheet at apoint beneath the face thereof and as close as possible to thewater-chamber of the boiler, all of which will more fully hereinafterappear.

In constructing my improvements and using them in connection with theordinary steam-boiler I provide a tube-sheet A with a plurality ofperforations B of substantially the tube-sheet and the boiler-flue.

' the same diameter as the tubes which are to be engaged therewith. arecountersunk, as at b, on the outside of These perforations the sheet andfor a depth of nearly half the thickness of a sheet. vided with athimble0, formed of soft copper, in which is inserted the tube or flue D, sothat its end at may be rolled over and flanged to engage the tube-sheetand press the copper against the same to calk the space between The tubeis then expanded in the usual manner, as at 01, so as to firmly set andfix the tube in its engagementwith the tube-sheet. By this constructionand arrangement it will be seen that the end of the tube is insertedbelow the face of the tube and in close proximity to the water-chamberof the boiler, so that whatever heat contacts the same may be quicklyabsorbed and transmitted or conducted to the water-chamber asefficiently as possible,

thus minimizing the danger of burning the boiler-fiues. I claim- Theyare then pro-' Ina steam-boiler, a tube-sheet provided with counterboredperforations, each perforation having its counterbore extended inwardand decreasing the thickness of the tubesheet around the perforationincombination with a tube for each perforation each tube having its endentered into .and passing through the perforation to lie within thecoun: terbore and Within the plane of the outer face of the tube-sheet,a thimble of calking metal around the end of each tube, anoutwardlyextending flange formed on the outer end of each tube and itssurrounding thimble en bore, and a bead turned out from the body ofgagingthe end face or wall of the counterthe tube adjacent to thetube-sheet and en gaging therewith for locking and securing the end ofthe tube in thetube-she'et with the extreme outer end in the space ofthe counterbore in close proximity to the interior of the boiler and thewater therein to have this CHARLES F. LAPE.

Witnesses:

CHAS. G. LUNDHOLM, ROBERT CUNNI GHAM.

